/*
 * Copyright (c) 2012, 2014, Oracle and/or its affiliates.
 * All rights reserved. Use is subject to license terms.
 *
 * This file is available and licensed under the following license:
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *  - Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *  - Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the distribution.
 *  - Neither the name of Oracle Corporation nor the names of its
 *    contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package com.oracle.javafx.scenebuilder.kit.util;

/**
 *
 */
public class MathUtils {

    /**
     * Returns true if the two specified double values are approximately equals.
     * @param v1 first double to check
     * @param v2 second double to check
     * @return true if the two specified double values are approximately equals.
     */
    public static boolean equals(double v1, double v2) {
        return Math.abs(v1 - v2) < 0.0000001;
    }

    /**
     * Returns true if the two specified double values are equal with
     * the specified tolerance.
     *
     * @param v1 first double to check
     * @param v2 second double to check
     * @param tolerance a strictly positive value
     * @return true if the two specified double values are approximately equals.
     */
    public static boolean equals(double v1, double v2, double tolerance) {
        assert tolerance > 0.0;
        return Math.abs(v1 - v2) <= tolerance;
    }


    /**
     * Return the distance between two points.
     * @param x1 x coordinate of the first point
     * @param y1 y coordinate of the first point
     * @param x2 x coordinate of the second point
     * @param y2 x coordinate of the second point
     * @return the distance between (x1, y1) and (x2, y2)
     */
    public static double distance(double x1, double y1, double x2, double y2) {
        final double dx = x2 - x1;
        final double dy = y2 - y1;
        return Math.sqrt(dx * dx + dy * dy);
    }
}
